App.js

addMessage = ({ message }) => {
  if (!this.user) {
    this.user = { name: message.text, id: Date.now().toString() };

    let newMessage = Object.assign({}, message);
    newMessage.text = `Welcome to the chat ${message.text}!`;
    newMessage.author = this.bot;

    this.setState({
      messages: [...this.state.messages, newMessage]
    });
  } else {
    //TODO: Send message across the channel
  }
};